IIRC, some years back one of the car mags did extensive testing of cold-air induction systems. I do recall one thing they mentioned was boundary layer air and the need to raise most scoops higher above the hood line to realize a true gain. "Ram Air" is somewhat of a misnomer as related to automobiles and seems to really be confusing some folks who are trying to take it literally.
Tim
'71 Charger 383/727 '17 Challenger SXT (Wifeys car )